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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Identifying the dietary source of polyphagous Helicoverpa armigera (Hubner) using carbon isotope signatures.
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Identifying the dietary source of polyphagous Helicoverpa armigera (Hubner) using carbon isotope signatures.

机译：使用碳同位素特征识别多食性棉铃虫（Hubner）的饮食来源。

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A controlled experiment was conducted under laboratory conditions where the neonates of H. armigera were fed till pupation on different hosts, i.e. tomato, bhendi [okra], chickpea, maize and chickpea-based artificial diet. A set of pupae was collected from a nearby bhendi field along with fruit samples from the same field. In another experiment, insects were reared on bhendi till the end of the second instar and subsequently shifted to chickpea-based artificial diet till pupation. The C isotope differed significantly among the several host plant species with maize, a C4 species, having the lowest C isotope. Among the C3 host species, bhendi had the lowest C isotope compared to others. A significant positive relationship between pupal C isotope and host plant C isotope was noticed, suggesting that the insects acquire isotopic signatures from what they feed on. To more conclusively assess this effect, H. armigera larvae were fed on bhendi up to the end of second instar and then shifted to a chickpea-based diet till pupation with agar as one of the important components. The C isotope of the pupae was intermediate between that of bhendi and the diet. Further, the C isotope of the pupae of H. armigera collected from a bhendi was determined vis-a-vis host plant samples. The insect C isotope closely matched that of the host plant, reiterating that the C isotope signatures indicate the feeding habits of insects. The results suggest that the C isotope signature of the insect accurately reflects the host organic C source and thus would provide vital clues on host plant on which the moth has fed as a larva..
机译：在实验室条件下进行了一项对照实验，在该条件下，将棉铃虫的新生儿喂食至化粪在不同的宿主上，即番茄，比邻地黄秋葵，鹰嘴豆，玉米和鹰嘴豆为基础的人工饮食。从附近的bhendi田地收集了一组of，并从同一田中收集了水果样品。在另一个实验中，将昆虫饲养在bhendi上，直到第二龄期结束，然后转移到鹰嘴豆为基础的人工饮食中，直至化ation。在几种寄主植物中，C同位素差异显着，其中玉米（C4物种）的C同位素最低。在C3宿主物种中，与其他物种相比，苯二地的C同位素最低。 p碳同位素与寄主植物C同位素之间存在显着的正相关关系，这表明昆虫从它们的摄食中获得了同位素特征。为了更确切地评估这种效果，在第二龄期结束前，对棉铃虫幼虫进行了食性试验，然后转为鹰嘴豆型饮食，直到以琼脂作为重要成分之一进行化one。 the的C同位素介于bhendi和饮食之间。此外，相对于宿主植物样品确定了从bhendi收集的棉铃虫。的C同位素。昆虫的C同位素与寄主植物的C同位素紧密匹配，重申C同位素特征表明昆虫的摄食习性。结果表明，昆虫的C同位素特征准确地反映了宿主有机C的来源，因此将为以蛾为幼虫的宿主植物提供重要的线索。

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